Merge pull request #2769 from matrix-org/matthew/hit_the_gin

switch back from GIST to GIN indexes

synapse/storage/background_updates.py

@@ -242,6 +242,25 @@ class BackgroundUpdateStore(SQLBaseStore):
         """
         self._background_update_handlers[update_name] = update_handler
 
+    def register_noop_background_update(self, update_name):
+        """Register a noop handler for a background update.
+
+        This is useful when we previously did a background update, but no
+        longer wish to do the update. In this case the background update should
+        be removed from the schema delta files, but there may still be some
+        users who have the background update queued, so this method should
+        also be called to clear the update.
+
+        Args:
+            update_name (str): Name of update
+        """
+        @defer.inlineCallbacks
+        def noop_update(progress, batch_size):
+            yield self._end_background_update(update_name)
+            defer.returnValue(1)
+
+        self.register_background_update_handler(update_name, noop_update)
+
     def register_background_index_update(self, update_name, index_name,
                                          table, columns, where_clause=None,
                                          unique=False,

synapse/storage/registration.py

@@ -39,12 +39,7 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
         # we no longer use refresh tokens, but it's possible that some people
         # might have a background update queued to build this index. Just
         # clear the background update.
-        @defer.inlineCallbacks
-        def noop_update(progress, batch_size):
-            yield self._end_background_update("refresh_tokens_device_index")
-            defer.returnValue(1)
-        self.register_background_update_handler(
-            "refresh_tokens_device_index", noop_update)
+        self.register_noop_background_update("refresh_tokens_device_index")
 
     @defer.inlineCallbacks
     def add_access_token_to_user(self, user_id, token, device_id=None):

synapse/storage/schema/delta/38/postgres_fts_gist.sql

@@ -13,5 +13,7 @@
  * limitations under the License.
  */
 
- INSERT into background_updates (update_name, progress_json)
-     VALUES ('event_search_postgres_gist', '{}');
+-- We no longer do this given we back it out again in schema 47
+
+-- INSERT into background_updates (update_name, progress_json)
+--     VALUES ('event_search_postgres_gist', '{}');

synapse/storage/schema/delta/47/postgres_fts_gin.sql

@@ -0,0 +1,17 @@
+/* Copyright 2018 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+INSERT into background_updates (update_name, progress_json)
+    VALUES ('event_search_postgres_gin', '{}');

synapse/storage/search.py

@@ -38,6 +38,7 @@ class SearchStore(BackgroundUpdateStore):
     EVENT_SEARCH_UPDATE_NAME = "event_search"
     EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
     EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist"
+    EVENT_SEARCH_USE_GIN_POSTGRES_NAME = "event_search_postgres_gin"
 
     def __init__(self, db_conn, hs):
         super(SearchStore, self).__init__(db_conn, hs)
@@ -48,9 +49,19 @@ class SearchStore(BackgroundUpdateStore):
             self.EVENT_SEARCH_ORDER_UPDATE_NAME,
             self._background_reindex_search_order
         )
-        self.register_background_update_handler(
+
+        # we used to have a background update to turn the GIN index into a
+        # GIST one; we no longer do that (obviously) because we actually want
+        # a GIN index. However, it's possible that some people might still have
+        # the background update queued, so we register a handler to clear the
+        # background update.
+        self.register_noop_background_update(
             self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME,
-            self._background_reindex_gist_search
+        )
+
+        self.register_background_update_handler(
+            self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME,
+            self._background_reindex_gin_search
         )
 
     @defer.inlineCallbacks
@@ -151,25 +162,48 @@ class SearchStore(BackgroundUpdateStore):
         defer.returnValue(result)
 
     @defer.inlineCallbacks
-    def _background_reindex_gist_search(self, progress, batch_size):
+    def _background_reindex_gin_search(self, progress, batch_size):
+        """This handles old synapses which used GIST indexes, if any;
+        converting them back to be GIN as per the actual schema.
+        """
+
         def create_index(conn):
             conn.rollback()
+
+            # we have to set autocommit, because postgres refuses to
+            # CREATE INDEX CONCURRENTLY without it.
             conn.set_session(autocommit=True)
-            c = conn.cursor()
 
-            c.execute(
-                "CREATE INDEX CONCURRENTLY event_search_fts_idx_gist"
-                " ON event_search USING GIST (vector)"
-            )
+            try:
+                c = conn.cursor()
 
-            c.execute("DROP INDEX event_search_fts_idx")
+                # if we skipped the conversion to GIST, we may already/still
+                # have an event_search_fts_idx; unfortunately postgres 9.4
+                # doesn't support CREATE INDEX IF EXISTS so we just catch the
+                # exception and ignore it.
+                import psycopg2
+                try:
+                    c.execute(
+                        "CREATE INDEX CONCURRENTLY event_search_fts_idx"
+                        " ON event_search USING GIN (vector)"
+                    )
+                except psycopg2.ProgrammingError as e:
+                    logger.warn(
+                        "Ignoring error %r when trying to switch from GIST to GIN",
+                        e
+                    )
 
-            conn.set_session(autocommit=False)
+                # we should now be able to delete the GIST index.
+                c.execute(
+                    "DROP INDEX IF EXISTS event_search_fts_idx_gist"
+                )
+            finally:
+                conn.set_session(autocommit=False)
 
         if isinstance(self.database_engine, PostgresEngine):
             yield self.runWithConnection(create_index)
 
-        yield self._end_background_update(self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME)
+        yield self._end_background_update(self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME)
         defer.returnValue(1)
 
     @defer.inlineCallbacks
@@ -289,7 +323,30 @@ class SearchStore(BackgroundUpdateStore):
                 entry.stream_ordering, entry.origin_server_ts,
             ) for entry in entries)
 
+            # inserts to a GIN index are normally batched up into a pending
+            # list, and then all committed together once the list gets to a
+            # certain size. The trouble with that is that postgres (pre-9.5)
+            # uses work_mem to determine the length of the list, and work_mem
+            # is typically very large.
+            #
+            # We therefore reduce work_mem while we do the insert.
+            #
+            # (postgres 9.5 uses the separate gin_pending_list_limit setting,
+            # so doesn't suffer the same problem, but changing work_mem will
+            # be harmless)
+            #
+            # Note that we don't need to worry about restoring it on
+            # exception, because exceptions will cause the transaction to be
+            # rolled back, including the effects of the SET command.
+            #
+            # Also: we use SET rather than SET LOCAL because there's lots of
+            # other stuff going on in this transaction, which want to have the
+            # normal work_mem setting.
+
+            txn.execute("SET work_mem='256kB'")
             txn.executemany(sql, args)
+            txn.execute("RESET work_mem")
+
         elif isinstance(self.database_engine, Sqlite3Engine):
             sql = (
                 "INSERT INTO event_search (event_id, room_id, key, value)"